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    STUDIA GEOLOGIA - Issue no. 2 / 2013  
         
  Article:   BIOEROSIVE STRUCTURES IN ORBITOLINID FORAMINIFERA: EXAMPLES FROM THE LOWER CRETACEOUS OF CENTRAL IRAN.

Authors:  FELIX SCHLAGINTWEIT, IOAN I. BUCUR.
 
       
         
  Abstract:  Lower Cretaceous orbitolinid assemblages from Central Iran yield various bioerosional structures. The omnipresent traces of different boring taxa and groups (e.g., sponges, calcimicrobes, incertae sedis) represent a characteristic feature of the investigated thin-section material. The assemblage can be attributed to the Entobia ichnofacies dominated by borings assigned to the activity of sponges. The boring galleries are often concentrated in a plane parallel to the test surface, along the boundary of the marginal and the central zone of the orbitolinid tests. The borings are observed in foraminiferan-dasycladalean wackestones to poorly washed-out packstones, which can be referred to a subtidal palaeoenvironment.

Key words: bioerosion, ichnology, orbitolinid foraminifera, bacinellid fabrics, Entobia ichnofacies, Iran, Lower Cretaceous
 
         
     
         
         
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